Step 3: Spray-paint the box black. Once it dries, paint a gray screen on the front, as shown, leaving a wider swath of black at the top than on the sides and bottom. Let dry, then frame the screen with a painted border in a color of your choice — we used navy. Let dry.

Step 4: Working freehand and using this photo for reference, sketch out a skeletal rib cage, in pencil, on the screen. If desired, add silly swallowed objects, such as an alarm clock or key ring. Paint white.

Step 5: Simulate control knobs by using wood glue to affix four gray plastic soda lids in the upper left-hand corner of the box. With a fine-tip brush and white paint, mark the knobs on, off, high, and low, and label the box X-RAY.